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Abstract
A simple method for the determination of ultra-trace levels of iron in aqueous solution is based upon volatilization of the analyte as the trifluoroacetylacetonate. The volatile chelate is purged directly from the aqueous sample into a laminar argon-hydrogen-entrained air flame. The atomic fluorescence signal of iron is enhanced by a factor of about 250, with respect to pneumatic nebulization into a sheathed premixed air-acetylene flame. The noise level of the diffusion flame is about 6 times lower than that of the premixed flame. The practical detection limit is 0.1 ppb Fe and is limited by reagent blank. The detection limit based on system noise alone is 0.012 ppb. Analysis of high salt matrices is shown to be possible.